package com.twu.biblioteca;

import java.util.List;

public class NullBook extends Book {

    public NullBook() {
        super("", "", "");
    }

    public int getAvailableCopies() {
        return 0;
    }

    public boolean reserve(String ownerId) {
        return false;
    }

    public String toString(){
        return "";
    }

    public void setCopyList(List<Copy> copyList) {

    }

    public void addCopy(String copyID) {

    }

    public boolean isNull() {
        return true;
    }
}
